Diazotizable disazo dyes for cotton.



and useful Improvements WILHELM nanz snrte, or WILM MANY, assienons r0 BER-LIN, GERMANY.

' ERSDORF, am) WERNER LANGE, 0F TREPTOW, GER- a'cminn GnsELLsoHAFtr Fun ANILIN FABRIKATION, 0F

DIAZOTIZABLE DISAZO DYES FOR COTTON.

No Drawing.

To all whom it may concern:

Be it known that We, VVILHELM Hnaznnne' and VVnRNnR' LANsn, citizens of the German Empire, residing, respectively, at Wilmersdorf, near Berlin, Germany, and Twptow, near Berlin, Germany, have invented new in Diazotizable Disazo Dyes for Cotton of which the following is a specification.

According to the present invention new cotton dyes are obtained by combining one molecular proportion of a symmetrical 3.3:

dianlinodiarylurea of the benzene series with one molecular proportion of each of two different diazo compounds of which one is derived froin'a basic amin, the other from an amino-acid} The disazo dyes obtained in this manner, and corresponding to the general formula:

Where X represents a univalent radical and A the residue of an aromatic acid, dye cotton directly yellow to orange, they can be diazotized on the fiber and coupled with suitable components. When they are developed with Q-naphthol powerful Bordeaux to red-brown tints are produced of good fastncss to washing. i

1. 173 arts by Weight of sulfanilic acid are diazoiized and inixed with a cooled hydrochloric acid solution of 270 parts of 3.3- diaminoditoly lurea. The free mineral acid is slowly neutralized by means of sodium acetate. v When the combination is complete the intermediate product is coupled with a diazo solution prepared from 93 parts of anilin, the mineral acid being absorbed by sodium acetate The dye is filtered, convert- Specification of Letters Patent. Application filed October 21,1912. Serial No. 727,013.

1 ed into its sodium Patented Nov. 11, 1913..

salt by dissolving it with sodium carbonate, salted out, drained and dried. p

2. 207 parts of .3 chloroanilin-6-sultonic acid are diazotized in the usual manner and added to a cooled hydrochloric acid solution of 242 parts of 8.3-diaminodiphenylurea. In the course of several hours a solution of sodium acetate is allowed to run into the mixture until the free mineral acid has disappeared. As soon as no more diazo compound is to be recognized there is added a diazo solution prepared from 127 parts of Q-chloro-aniliu. The mineral acidis again bound by adding sodium acetate .and the whole is stirred until combiinition is con1- plete. The dye isclrained, dissolved with aid of sodium carbonate in hot water and It corresponds to the formula;

salted out.

S OgNtl The dyes obtainable by the above de scribed process are in the dried and pulver ized shape of their sodium salts orange powdei's, easily soluble in Water to a yellow solution, not changing the' color on the addition of soda-lye or ammonia. From the solution hydrochloric acid precipitates the brown dye acid. The dyes are diliicultly soluble in alcohol; they dissolve in concentrated sulfuric acid with abrown-red color,

on addition, of me being separated as brown" flakes. By heating with zinc dust the aqueous solution is decolorized, the dye being split oil yielding from which the diazo compouiillsjqvere pre pared, besides asymmetrical BBXlX-i'tetraaminodiarylurea.

Having now described our invention and the aminoa izy l compounds I the manner in which it may be performed metic amin, an aromatic amino-acid end a what we claim 1s, symmetrical 3.3.6.6-tetraam1nod1erylurea.

1. The herein-described process for the 3. The herein described new disazo dye manufacture of diazotizeble disezo dyes for having as sodium salt the formula:

cotton by combining one molecular proper- H 35 tion of a symmetrical 3.3'-dieminodiarylurea of the benzene-series with one molecular p/ proportion of each of two difierent diazo HN compounds-Lot which one is derived from a t basic emin, the other from an amino-acid. 1 40 '2. The herein-described new disaz'o-dyes H I f- 1,5 Aryl--N==N- m1, some 4 5 being an orange powder, easily soluble in n water to a yellow, in concentrated sulfuric acid to a brown-red solution, by reduction 7 h yielding .Z-chloroenilin, 3:chloroanilin-ES-sul- A tonic acid and symmetrical 3.3.6.6-tetrn- 50 AN=N I-/ aminotlilihenylurez In testimony whereof we have signed our names to this specification in the presence X of two subscribing witnesses. 1:3 :11:fissure?ei fieitf e as? WILHELM EMERG- l a L 1 wen-nee LANGE.

verized dry sodium salts'being orange powders, easily soluble .111 water to a yellow, in Witnesses: concentrated sulfuric acid to e brown-red HENRY Hnsrnn,

solution, by reduction yielding a basic ero- WOLDEMAR HAUPT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner oi Ietents,

Washington, D. G. 

